Demigods really, really, need mental health counseling. Some child of Apollo needs to grow up and become a counselor or a therapist. Think about it. They're basically child soldiers, they put their lives on the line every day, they witness the deaths of their friends, and sometimes it seems no one even cares. The only really good adult figure they have looking out for them is Chiron. Mr. D doesn't count. The gods don't act like they care. I think most demigods could benefit from it, particularly those like Leo and Nico who show pretty clear signs of depression. It may even have saved Luke and Ethan, preventing the second titan war, and resulting deaths. But then, there'd be no story, I guess.